adding datetime column

app.py

@@ -38,6 +38,9 @@ def prepare_data():
     FROM read_parquet('./live_data/markets_live_data.parquet')
     """
     df = con.execute(query).fetchdf()
+    df["sample_datetime"] = df["sample_timestamp"].apply(
+        lambda x: datetime.fromtimestamp(x)
+    )
     return df